Question: A telemarketer makes six phone calls per hour and is able to make a sale on 30% of these contacts. During the next 2 hours,

A telemarketer makes six phone calls per hour and is able to make a sale on 30% of these contacts. During the next 2 hours, find:
a. The probability of making exactly four sales.
b. The probability of making no sales.
c. The probability of making exactly two sales.
d. The mean number of sales in the 2-hour period.

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